As Sajdah Ayah 17

فَلَا تَعْلَمُ نَفْسٌ مَّآ أُخْفِىَ لَهُم مِّن قُرَّةِ أَعْيُنٍ جَزَآءَۢ بِمَا كَانُواْ يَعْمَلُونَ ١٧ No soul can imagine what delights are kept in store for them as a reward for what they used to do.